Being a dog show application is one thing, but allowing a dog club or a dog organization such as a kennel club to manage his membership is a completely different story. 
Just imagine yourself, how many things are related to a member of a club. He might deserve discounts, notifications, private access to a members area on the site, mailing list, invoices, membership start & end dates and plenty more things, on top of it you have to combine with GDPR rules, cause you have to respect your users' privacy.